WO2004031552A2 - Internal combustion engine comprising an exhaust gas turbocharger and an exhaust gas recirculation device - Google Patents

Internal combustion engine comprising an exhaust gas turbocharger and an exhaust gas recirculation device Download PDF

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Publication number
WO2004031552A2
WO2004031552A2 PCT/EP2003/009851 EP0309851W WO2004031552A2 WO 2004031552 A2 WO2004031552 A2 WO 2004031552A2 EP 0309851 W EP0309851 W EP 0309851W WO 2004031552 A2 WO2004031552 A2 WO 2004031552A2
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
line
internal combustion
combustion engine
flow
Prior art date
Application number
PCT/EP2003/009851
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German (de)
French (fr)
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WO2004031552A3 (en
Inventor
Siegfried Sumser
Wolfram Schmid
Original Assignee
Daimler Chrysler Ag
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Publication of WO2004031552A2 publication Critical patent/WO2004031552A2/en
Publication of WO2004031552A3 publication Critical patent/WO2004031552A3/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/02—Gas passages between engine outlet and pump drive, e.g. reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/02—Gas passages between engine outlet and pump drive, e.g. reservoirs
    • F02B37/025—Multiple scrolls or multiple gas passages guiding the gas to the pump drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/22—Control of the pumps by varying cross-section of exhaust passages or air passages, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • part of the exhaust gas from the exhaust gas line upstream of the turbine can be directed into the intake tract downstream of the compressor via an exhaust gas recirculation device, in particular at low loads and engine speeds.
  • an exhaust gas recirculation line branches off from the exhaust gas line, which supplies the smaller of the two flow channels with exhaust gas, in which an adjustable check valve is arranged.
  • the invention is based on the problem of a larger work or operating allow area in which exhaust gas recirculation can be carried out.
  • the participating amount of exhaust gas is increased by coupling the strands.
  • the exhaust line which is assigned to the larger of the two flow streams is connected either directly or indirectly to the return line via a connecting line, a unidirectional flow valve being arranged in the connecting line, for example a check valve or a flap valve, which controls the flow of exhaust gas through the Only releases the connecting line in the direction of the return line.
  • the unidirectional flow valve blocks the exhaust gas from flowing back through the connecting line back into the exhaust line in all operating states.
  • This embodiment makes it possible to utilize pressure pulsations in the exhaust line assigned to the larger flow flood despite a lower mean pressure level in this exhaust line for the overflow of exhaust gas to the side of the smaller flow flood or the exhaust gas recirculation device, provided the pressure peaks in the exhaust line of the larger flow flood at times exceed the currently prevailing pressure in the area of the smaller flow flood.
  • these pressure peaks lead to an overflow of exhaust gas and an increase in the pressure in the area of the exhaust pipe of the smaller flow stream or the exhaust gas recirculation device.
  • the increased pressure level and the participating, increased amount of exhaust gas enables exhaust gas recirculation in a larger operating range than is the case in the prior art.
  • An automatically operating valve is expediently used as the flow valve, in particular a non-return valve which only opens in one direction and blocks in the opposite direction, or a flutter valve which also works unidirectionally. Control interventions to set the switching state of the valve are not necessary.
  • the connecting line including the. unidirectional flow valve between the two exhaust pipes for the larger and the smaller flow flood of the exhaust gas turbine. Because of the smaller cross section of the smaller flow stream and the increased backflow capacity, a higher, average pressure level prevails in this part of the exhaust line than in the part of the exhaust line assigned to the larger flow flow.
  • the peak pressure of the pressure pulsations that spread into the exhaust pipe of the larger flow flood can exceed the current pressure value of the opposite exhaust pipe, as a result of which an exhaust gas transfer via the connecting line and the unidirectional flow valve is made possible. Since the exhaust gas recirculation line branches off from the exhaust gas line of the smaller flow stream, the increased pressure level in the exhaust pipe of the smaller flow stream also benefits the exhaust gas recirculation.
  • the connecting line is arranged between the exhaust line of the larger flow stream and directly the return line of the exhaust gas recirculation device.
  • a unidirectional flow valve can also be arranged in the line section between the exhaust line of the smaller flow stream and the exhaust gas return line, so that the pressure peaks prevailing in this exhaust line are also introduced into the return line. be fed and thus a further increase in pressure can be achieved in the exhaust gas recirculation device.
  • Fig. 1 is a schematic representation of a charged
  • FIG. 2 shows an internal combustion engine corresponding to FIG. 1, but with a connecting line including unidirectional flow valve between the exhaust line of the larger flow stream and the exhaust gas recirculation line,
  • FIG 3 shows an internal combustion engine with a double-flow exhaust gas turbine, the exhaust gas lines to the two flow passages being connected via a connecting line to a unidirectional flow valve, with a variable turbine geometry in the exhaust gas turbine.
  • the internal combustion engine 1 shown in FIG. 1 - a gasoline engine or a diesel engine - is an exhaust gas turbocharger 2 with an exhaust gas turbine 3 in the exhaust line 4 and a compressor 5 assigned in the intake tract 6, the compressor wheel in the compressor 5 being driven by a turbine wheel 8 in the exhaust gas turbine 3 via a shaft 7.
  • the turbine wheel 8 is driven by the pressurized exhaust gases from the internal combustion engine.
  • the compressor 5 draws in combustion air at ambient pressure pi and compresses it to an increased pressure p 2 .
  • a charge air cooler 9 arranged downstream of the compressor 5 in the intake tract 6, the compressed combustion air is cooled and then fed to the cylinders of the internal combustion engine under a boost pressure p 2s via a flow regulating device 10.
  • the internal combustion engine 1 has, in particular, a V-shape and has two cylinder banks or cylinder banks 1 a and 1 b, the exhaust gases of which are supplied via separate exhaust gas lines 4 a and 4 b, which are each part of the exhaust gas line 4, to two separate flow streams 11 a and 11 b in the exhaust gas turbine 3.
  • the exhaust gas back pressure in the exhaust gas line shown on the left in the figure is designated p 3L
  • the exhaust gas back pressure in the second, right exhaust gas line is designated p 3R .
  • the two flow flows 11a and 11b in the exhaust gas turbine 3 are upstream of the turbine wheel 8.
  • the exhaust gas which is under exhaust gas back pressure and enters the two flow passages 11a and 11b, is directed to the turbine blades of the turbine wheel 8 via a flow inlet cross section and thereby drives the turbine wheel.
  • the two flow channels 11a and 11b have a cross section of different sizes, the left flow channel 11a having a smaller cross section than the right flow channel 11b.
  • the two flow channels 11a and 11b are separated by an intermediate partition wall 12, which divides the two flow channels from one another in a pressure-tight and flow-tight manner.
  • variable turbine geometry 13 In the flow inlet cross-section between the flow channels 11a and 11b and the turbine wheel 8 is arranged a variably adjustable turbine geometry 13, by means of which the effective turbine inlet cross-section can be set as a function of state and operating variables of the internal combustion engine and of the units assigned to the internal combustion engine.
  • the variable turbine geometry is designed as a guide vane that can be inserted into the flow inlet cross section, but other designs are also possible, for example a guide vane with guide vanes that can be adjusted about an axis of rotation.
  • an exhaust gas recirculation device 14 is provided, via which exhaust gas can be transferred from the exhaust line 4 upstream of the exhaust gas turbine 3 into the intake tract 6 downstream of the compressor 5.
  • the exhaust gas recirculation device 14 comprises an exhaust gas recirculation line 15, in which an adjustable recirculation valve 16 and an exhaust gas cooler 17 are arranged.
  • the exhaust gas recirculation line 15 branches off from the left exhaust line 4a, which is assigned to the smaller flow stream 11a.
  • All adjustable units can be set via a regulating and control unit 18 as a function of state and operating variables of the internal combustion engine 1 and of the units themselves.
  • the two exhaust gas lines 4a and 4b are connected upstream of the exhaust gas turbine 3 via a connecting line 19, in which a unidirectional flow valve 20 is arranged, which allows exhaust gas to pass in only one direction, namely from the exhaust gas line 4b, which is associated with the larger flow stream 11b , towards the exhaust pipe 4a, which is associated with the smaller flow flood 11a.
  • An ejector can be arranged in the region of the junction of the connecting line 19 into the exhaust gas line 4a, via which the exhaust gas flow is supported into the exhaust gas line 4a.
  • the unidirectional flow valve 20 is designed as an automatically operating valve, which does not require any control setting.
  • the flow control valve 20 is, for example, a check valve or a flutter valve.
  • This flow valve allows exhaust gas to pass from the right exhaust line 4b into the left exhaust line 4a in the event that pressure peaks in the exhaust line 4b generated by pressure pulsations exceed the current pressure in the left exhaust line 4a. As a result, the pressure level prevailing in the left exhaust line 4a is increased. Since the exhaust gas recirculation line 15 of the exhaust gas recirculation device 14 branches off from the left exhaust gas line 4a, the operating range in which exhaust gas recirculation can be carried out is widened.
  • a controllable or adjustable unidirectional flow valve 20 can also be considered, which can in particular be transferred to a closing position blocking any flow.
  • a bypass line 21 branches off from the exhaust line and represents a bypass to the exhaust gas turbine 3.
  • an adjustable drain valve 22 in the exhaust line 4a which is switched into a position opening the bypass line 21, in particular at higher engine speeds, so that exhaust gas can be discharged from the exhaust line 4a bypassing the exhaust gas turbine and under the relaxed pressure p is dissipated.
  • the connecting line 19 branches off downstream of the exhaust gas turbine 3 from the right exhaust line 4b, which is assigned to the larger flow stream 11b of the turbine, and opens directly into the exhaust gas recirculation line 15 downstream of the recirculation valve 16.
  • the recirculation valve 16, which is arranged in a line section between the exhaust gas recirculation line 15 and the left exhaust gas line 4a for the smaller flow flood 11a, can also be designed as a unidirectional flow valve, for example as a check valve or as a flap valve, so that pressure peaks are passed through the exhaust gas recirculation valve 16 and transmitted into the exhaust gas recirculation line 15, which are present in the left exhaust gas line 4a and exceed the currently prevailing pressure in the exhaust gas recirculation line 15.
  • additional pressure peaks are transmitted from the right exhaust gas line 4b into the exhaust gas recirculation line 15, which likewise exceed the pressure currently prevailing in the exhaust gas recirculation line 15.
  • the connecting line 19 is arranged between the two exhaust lines 4a and 4b.
  • the unidirectional flow valve 20 allows a flow of exhaust gas from the right exhaust pipe 4b to the left exhaust pipe 4a.
  • the exhaust gas mass flow to be transferred to the intake tract 6 is regulated with the aid of the adjustable recirculation valve 16 in the exhaust gas recirculation line 15.
  • the exhaust gas turbine 3 is also equipped with a variable turbine geometry 13, which, however, in contrast to the previous exemplary embodiments, is limited to the flow inlet cross section from the larger flow stream 11b to the turbine wheel 8, whereas in the flow inlet cross section the smaller flow stream 11a to the turbine wheel 8 is a grid 23 is arranged with a fixed geometry.
  • the variable turbine geometry 13 is designed as a guide grill with adjustable.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Supercharger (AREA)

Abstract

Disclosed is an internal combustion engine comprising an exhaust gas turbocharger, the exhaust gas turbine of which is provided with two separate stream flows having different cross sections, each stream flow being connected to one respective exhaust pipe that supplies the internal combustion engine with exhaust gas. Said internal combustion engine further comprises an exhaust gas recirculation device with an exhaust gas recirculation pipe that connects the exhaust pipe associated with the smaller stream flow to the intake section of the internal combustion engine. The exhaust pipe associated with the larger stream flow communicates with the exhaust gas recirculation pipe via a connecting pipe, within which a one-directional flow valve is disposed.

Description

Brennkraftmaschine mit einem Abgasturbolader und einer Abgasrückführeinrichtung Internal combustion engine with an exhaust gas turbocharger and an exhaust gas recirculation device
Die Erfindung bezieht sich auf eine Brennkraftmaschine mit einem Abgasturbolader und einer Abgasrückführeinrichtung nach dem Oberbegriff des Anspruches 1.The invention relates to an internal combustion engine with an exhaust gas turbocharger and an exhaust gas recirculation device according to the preamble of claim 1.
Aus der Druckschrift DE 100 48 237 AI ist eine aufgeladene Brennkraftmaschine bekannt, deren Abgasturbine zwei Strömungsfluten unterschiedlichen Durchmessers aufweist, die über separate Abgasleitungen mit dem Abgas jeweils eines Teils der Zylinder der Brennkraftmaschine beaufschlagt werden. Die Strömungsfluten sind dem Turbinenrad vorgelagert, wobei das in die Strömungsfluten eingeführte Abgas über jeweils einen Strömungseintrittsquerschnitt dem Turbinenrad zugeführt wird, das daraufhin in Rotation versetzt wird und über eine Welle ein Verdichterrad antreibt, das Verbrennungsluft aus der Umgebung ansaugt und auf einen erhöhten Ladedruck verdichtet, unter dem die Verbrennungsluft den Zylindereinlässen zugeführt wird. Zur Verbesserung des Abgasverhaltens kann über eine Abgasrückführeinrichtung insbesondere bei niedrigen Lasten und Drehzahlen der Brennkraftmaschine ein Teil des Abgases aus dem Abgasstrang stromauf der Turbine in den Ansaugtrakt stromab des Verdichters geleitet werden. Hierfür zweigt von der Abgasleitung, die die kleinere der beiden Strömungs- fluten mit Abgas versorgt, eine Abgasrückführleitung ab, in welcher ein einstellbares Sperrventil angeordnet ist.A supercharged internal combustion engine is known from the publication DE 100 48 237 AI, the exhaust gas turbine of which has two flow flows of different diameters, each of which is supplied with the exhaust gas of a part of the cylinders of the internal combustion engine via separate exhaust gas lines. The flow streams are upstream of the turbine wheel, the exhaust gas introduced into the flow streams being fed to the turbine wheel via a flow inlet cross section, which is then set in rotation and drives a compressor wheel via a shaft, which draws combustion air from the environment and compresses it to an increased boost pressure, under which the combustion air is fed to the cylinder inlets. To improve the exhaust gas behavior, part of the exhaust gas from the exhaust gas line upstream of the turbine can be directed into the intake tract downstream of the compressor via an exhaust gas recirculation device, in particular at low loads and engine speeds. For this purpose, an exhaust gas recirculation line branches off from the exhaust gas line, which supplies the smaller of the two flow channels with exhaust gas, in which an adjustable check valve is arranged.
Von diesem Stand der Technik ausgehend liegt der Erfindung das Problem zugrunde, einen größeren Arbeits- bzw. Betriebs- bereich zu ermöglichen, in welchem eine Abgasrückführung durchgeführt werden kann.Starting from this prior art, the invention is based on the problem of a larger work or operating allow area in which exhaust gas recirculation can be carried out.
Dieses Problem wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst. Die Unteransprüche geben zweckmäßige Weiterbildungen an.This problem is solved according to the invention with the features of claim 1. The subclaims indicate appropriate further training.
Erfindungsgemäß ist vorgesehen, dass die teilnehmende Abgasmenge durch Kopplung der Stränge erhöht wird. Hierzu wird diejenige Abgasleitung, welche der größeren der beiden Strömungsfluten zugeordnet ist, über eine Verbindungsleitung entweder direkt oder indirekt mit der Rückführleitung verbunden, wobei in der Verbindungsleitung ein unidirektionales Strömungsventil angeordnet ist, beispielsweise ein Rückschlagventil oder ein Flatterventil, welches den Durchfluss von Abgas durch die Verbindungsleitung nur in Richtung der Rückführleitung freigibt . Das unidirektionale Ströτmmgsventil sperrt dagegen in allen Betriebszustanden einen Ruckfluss des Abgases über die Verbindungsleitung zurück in die Abgasleitung. Diese Ausführung ermöglicht es, Druckpulsationen in der der größeren Strömungsflut zugeordneten Abgasleitung trotz eines niedrigeren mittleren Druckniveaus in dieser Abgasleitung für das Überströmen von Abgas auf die Seite der kleineren Strömungs- flut bzw. der Abgasrückführeinrichtung auszunutzen, sofern die Druckspitzen in der Abgasleitung der größeren Strömungs- flut zeitweise den aktuell herrschenden Druck im Bereich der kleineren Strδmungsflut übersteigen. Diese Druckspitzen führen in Kombination mit dem unidirektionalen Strömungsventil zu einem Überströmen von Abgas und einer Erhöhung des Drucks im Bereich der Abgasleitung der kleineren Strömungsflut bzw. der Abgasrückführeinrichtung. Das erhöhte Druckniveau und die teilnehmende, erhöhte Abgasmenge ermöglicht eine Abgasrückführung in einem größeren Betriebsbereich, als dies im Stand der Technik der Fall ist. Hierdurch kann das Abgasverhalten der Brennkraftmaschine verbessert werden. Als Strömungsventil wird zweckmäßig ein selbsttätig arbeitendes Ventil eingesetzt, insbesondere ein Rückschlagventil, welches lediglich in eine Richtung öffnet und in Gegenrichtung sperrt, bzw. ein Flatterventil, das ebenfalls unidirek- tional arbeitet. Steuernde Eingriffe zur Einstellung des Schaltzustandes des Ventiles sind nicht erforderlich.According to the invention it is provided that the participating amount of exhaust gas is increased by coupling the strands. For this purpose, the exhaust line which is assigned to the larger of the two flow streams is connected either directly or indirectly to the return line via a connecting line, a unidirectional flow valve being arranged in the connecting line, for example a check valve or a flap valve, which controls the flow of exhaust gas through the Only releases the connecting line in the direction of the return line. The unidirectional flow valve, on the other hand, blocks the exhaust gas from flowing back through the connecting line back into the exhaust line in all operating states. This embodiment makes it possible to utilize pressure pulsations in the exhaust line assigned to the larger flow flood despite a lower mean pressure level in this exhaust line for the overflow of exhaust gas to the side of the smaller flow flood or the exhaust gas recirculation device, provided the pressure peaks in the exhaust line of the larger flow flood at times exceed the currently prevailing pressure in the area of the smaller flow flood. In combination with the unidirectional flow valve, these pressure peaks lead to an overflow of exhaust gas and an increase in the pressure in the area of the exhaust pipe of the smaller flow stream or the exhaust gas recirculation device. The increased pressure level and the participating, increased amount of exhaust gas enables exhaust gas recirculation in a larger operating range than is the case in the prior art. In this way, the exhaust gas behavior of the internal combustion engine can be improved. An automatically operating valve is expediently used as the flow valve, in particular a non-return valve which only opens in one direction and blocks in the opposite direction, or a flutter valve which also works unidirectionally. Control interventions to set the switching state of the valve are not necessary.
Gemäß einer ersten vorteilhaften Ausführung liegt die Verbindungsleitung einschließlich dem darin angeordneten, . unidirek- tionalen Strömungsventil zwischen den beiden Abgasleitungen für die größere und die kleinere Strömungsflut der Abgastur- bine. Aufgrund des kleineren Querschnittes der kleineren Strömungsflut und des erhöhten Rückstauvermögens herrscht in diesem Teil des Abgasstranges ein höheres, mittleres Druckniveau als in dem der größeren Strömungsflut zugeordneten Teil des Abgasstranges. Die Druckpulsationen, welche sich in die Abgasleitung der größeren Strömungsflut ausbreiten, können in ihrem Spitzenwert den aktuellen Druckwert der gegenüberliegenden Abgasleitung übersteigen, wodurch ein Abgasübertritt über die Verbindungsleitung und das unidirektionale Strömungsventil ermöglicht wird. Da die Abgasrückführleitung von der Abgasleitung der kleineren Strömungsflut abzweigt, kommt das gesteigerte Druckniveau in der Abgasleitung der kleineren Strömungsflut auch der Abgasrückführung zugute.According to a first advantageous embodiment, the connecting line, including the. unidirectional flow valve between the two exhaust pipes for the larger and the smaller flow flood of the exhaust gas turbine. Because of the smaller cross section of the smaller flow stream and the increased backflow capacity, a higher, average pressure level prevails in this part of the exhaust line than in the part of the exhaust line assigned to the larger flow flow. The peak pressure of the pressure pulsations that spread into the exhaust pipe of the larger flow flood can exceed the current pressure value of the opposite exhaust pipe, as a result of which an exhaust gas transfer via the connecting line and the unidirectional flow valve is made possible. Since the exhaust gas recirculation line branches off from the exhaust gas line of the smaller flow stream, the increased pressure level in the exhaust pipe of the smaller flow stream also benefits the exhaust gas recirculation.
Gemäß einer zweiten vorteilhaften Ausführung ist die Verbindungsleitung zwischen der Abgasleitung der größeren Strömungsflut und unmittelbar der Rückführleitung der Abgasrückführeinrichtung angeordnet. Im Leitungsabschnitt zwischen der Abgasleitung der kleineren Strömungsflut und der Abgasrückführleitung kann ebenfalls ein unidirektionales Strömungsventil angeordnet sein, so dass die in dieser Abgasleitung herrschenden Druckspitzen ebenfalls in die Rückführleitung einge- speist werden und somit eine weitere Drucksteigerung in der Abgasrückführeinrichtung erzielt werden kann.According to a second advantageous embodiment, the connecting line is arranged between the exhaust line of the larger flow stream and directly the return line of the exhaust gas recirculation device. A unidirectional flow valve can also be arranged in the line section between the exhaust line of the smaller flow stream and the exhaust gas return line, so that the pressure peaks prevailing in this exhaust line are also introduced into the return line. be fed and thus a further increase in pressure can be achieved in the exhaust gas recirculation device.
Weitere Vorteile und zweckmäßige Ausführungen sind den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:Further advantages and expedient designs can be found in the further claims, the description of the figures and the drawings. Show it:
Fig. 1 eine schematische Darstellung einer aufgeladenenFig. 1 is a schematic representation of a charged
Brennkraftmaschine mit einer zweiflutigen Abgastur- bine und einer zwischen Abgasstrang und Ansaugtrakt angeordneten Abgasrückführeinrichtung, wobei zwischen zwei Abgasleitungen, die jeweils zu einer Strömungsflut der Abgasturbine geführt sind, eine Verbindungsleitung mit einem unidirektionalen Strömungsventil angeordnet ist,Internal combustion engine with a double-flow exhaust gas turbine and an exhaust gas recirculation device arranged between the exhaust line and intake tract, wherein a connecting line with a unidirectional flow valve is arranged between two exhaust gas lines, each of which leads to a flow flood of the exhaust gas turbine,
Fig. 2 eine Fig. 1 entsprechende Brennkraftmaschine, jedoch mit einer Verbindungsleitung einschließlich u- nidirektionalem Strömungsventil zwischen der Abgasleitung der größeren Strömungsflut und der Abgasrückführleitung,2 shows an internal combustion engine corresponding to FIG. 1, but with a connecting line including unidirectional flow valve between the exhaust line of the larger flow stream and the exhaust gas recirculation line,
Fig. 3 eine Brennkraftmaschine mit zweiflutiger Abgasturbine, wobei die Abgasleitungen zu den beiden Strömungsfluten über eine Verbindungsleitung mit unidi- rektionale Strömungsventil verbunden sind, mit einer variablen Turbinengeometrie in der Abgasturbine .3 shows an internal combustion engine with a double-flow exhaust gas turbine, the exhaust gas lines to the two flow passages being connected via a connecting line to a unidirectional flow valve, with a variable turbine geometry in the exhaust gas turbine.
In den Figuren sind gleiche Bauteile mit gleichen Bezugszeichen versehen.In the figures, the same components are provided with the same reference symbols.
Der in Fig. 1 dargestellten Brennkraftmaschine 1 - ein Ottomotor oder ein Dieselmotor - ist ein Abgasturbolader 2 mit einer Abgasturbine 3 im Abgasstrang 4 sowie einem Verdichter 5 im Ansaugtrakt 6 zugeordnet, wobei das Verdichterrad im Verdichter 5 über eine Welle 7 von einem Turbinenrad 8 in der Abgasturbine 3 angetrieben wird. Das Turbinenrad 8 wird von den unter Druck stehenden Abgasen der Brennkraftmaschine angetrieben.The internal combustion engine 1 shown in FIG. 1 - a gasoline engine or a diesel engine - is an exhaust gas turbocharger 2 with an exhaust gas turbine 3 in the exhaust line 4 and a compressor 5 assigned in the intake tract 6, the compressor wheel in the compressor 5 being driven by a turbine wheel 8 in the exhaust gas turbine 3 via a shaft 7. The turbine wheel 8 is driven by the pressurized exhaust gases from the internal combustion engine.
Im Betrieb der Brennkraftmaschine saugt der Verdichter 5 unter Umgebungsdruck pi stehende Verbrennungsluft an und verdichtet diese auf einen erhöhten Druck p2. In einem stromab des Verdichters 5 im Ansaugtrakt 6 angeordneten Ladeluftkühler 9 wird die verdichtete Verbrennungsluft gekühlt und anschließend über eine Durchflussreguliereinrichtung 10 den Zylindern der Brennkraftmaschine unter dem Ladedruck p2s zugeführt. Die Brennkraftmaschine 1 weist insbesondere V-Form auf und besitzt zwei Zylinderbänke bzw. Zylinderreihen la und lb, deren Abgase über separate Abgas1eitungen 4a und 4b, die jeweils Bestandteil des Abgasstranges 4 sind, zwei separaten Strömungsfluten 11a und 11b in der Abgasturbine 3 zugeführt werden. Der Abgasgegendruck in der in der Figur links dargestellten Abgasleitung ist mit p3L, der Abgasgegendruck in der zweiten, rechten Abgasleitung mit p3R bezeichnet.During operation of the internal combustion engine, the compressor 5 draws in combustion air at ambient pressure pi and compresses it to an increased pressure p 2 . In a charge air cooler 9 arranged downstream of the compressor 5 in the intake tract 6, the compressed combustion air is cooled and then fed to the cylinders of the internal combustion engine under a boost pressure p 2s via a flow regulating device 10. The internal combustion engine 1 has, in particular, a V-shape and has two cylinder banks or cylinder banks 1 a and 1 b, the exhaust gases of which are supplied via separate exhaust gas lines 4 a and 4 b, which are each part of the exhaust gas line 4, to two separate flow streams 11 a and 11 b in the exhaust gas turbine 3. The exhaust gas back pressure in the exhaust gas line shown on the left in the figure is designated p 3L , the exhaust gas back pressure in the second, right exhaust gas line is designated p 3R .
Die beiden Strδmungsfluten 11a und 11b in der Abgasturbine 3 sind dem Turbinenrad 8 vorgelagert. Das in die beiden Strömungsfluten 11a und 11b gelangende, unter Abgasgegendruck stehende Abgas wird über einen Strömungseintrittsquerschnitt auf die Turbinenschaufeln des Turbinenrades 8 geleitet und treibt dadurch das Turbinenrad an. Die beiden Strömungsfluten 11a und 11b weisen einen unterschiedlich großen Querschnitt auf, wobei die linke Strömungsflut 11a einen kleineren Querschnitt besitzt als die rechte Strömungsflut 11b. Die beiden Strδmungsfluten 11a und 11b sind durch eine zwischenliegende Trennwand 12 separiert, die die beiden Strömungsfluten druckdicht und strömungsdicht gegeneinander abteilt. Im Strömungseintrittsquerschnitt zwischen den Strömungsfluten 11a und 11b und dem Turbinenrad 8 ist eine variabel einstellbare Turbinengeometrie 13 angeordnet, über die der wirksame Turbineneintrittsquerschnitt in Abhängigkeit von Zustands- und Betriebsgrößen der Brennkraftmaschine sowie der der Brennkraftmaschine zugeordneten Aggregate einstellbar ist. Die variable Turbinengeometrie ist im Ausführungsbeispiel als in den Strömungseintrittsquerschnitt einschiebbares Leitgitter ausgebildet, daneben kommen aber auch andere Ausführungen in Betracht, beispielsweise ein Leitgitter mit um eine Drehachse verstellbaren Leitschaufeln.The two flow flows 11a and 11b in the exhaust gas turbine 3 are upstream of the turbine wheel 8. The exhaust gas, which is under exhaust gas back pressure and enters the two flow passages 11a and 11b, is directed to the turbine blades of the turbine wheel 8 via a flow inlet cross section and thereby drives the turbine wheel. The two flow channels 11a and 11b have a cross section of different sizes, the left flow channel 11a having a smaller cross section than the right flow channel 11b. The two flow channels 11a and 11b are separated by an intermediate partition wall 12, which divides the two flow channels from one another in a pressure-tight and flow-tight manner. In the flow inlet cross-section between the flow channels 11a and 11b and the turbine wheel 8 is arranged a variably adjustable turbine geometry 13, by means of which the effective turbine inlet cross-section can be set as a function of state and operating variables of the internal combustion engine and of the units assigned to the internal combustion engine. In the exemplary embodiment, the variable turbine geometry is designed as a guide vane that can be inserted into the flow inlet cross section, but other designs are also possible, for example a guide vane with guide vanes that can be adjusted about an axis of rotation.
Des Weiteren ist eine Abgasrückführeinrichtung 14 vorgesehen, über die Abgas aus dem Abgasstrang 4 stromauf der Abgasturbine 3 in den Ansaugtrakt 6 stromab des Verdichters 5 überführt werden kann. Die Abgasrückführeinrichtung 14 umfasst eine Abgasrückführleitung 15, in welcher ein einstellbares Rückführventil 16 sowie ein Abgaskühler 17 angeordnet sind. Die Abgasrückführleitung 15 zweigt von der linken Abgasleitung 4a ab, welche der kleineren Strömungsflut 11a zugeordnet ist.Furthermore, an exhaust gas recirculation device 14 is provided, via which exhaust gas can be transferred from the exhaust line 4 upstream of the exhaust gas turbine 3 into the intake tract 6 downstream of the compressor 5. The exhaust gas recirculation device 14 comprises an exhaust gas recirculation line 15, in which an adjustable recirculation valve 16 and an exhaust gas cooler 17 are arranged. The exhaust gas recirculation line 15 branches off from the left exhaust line 4a, which is assigned to the smaller flow stream 11a.
Sämtliche einstellbaren Aggregate sind über eine Regel- und Steuereinheit 18 in Abhängigkeit von Zustands- und Betriebsgrößen der Brennkraftmaschine 1 sowie der Aggregate selbst einzustellen.All adjustable units can be set via a regulating and control unit 18 as a function of state and operating variables of the internal combustion engine 1 and of the units themselves.
Die beiden Abgasleitungen 4a und 4b sind stromauf der Abgasturbine 3 über eine Verbindungsleitung 19 verbunden, in welcher ein unidirektionales Strömungsventil 20 angeordnet ist, welches einen Übertritt von Abgas nur in einer Richtung gestattet, nämlich von der Abgasleitung 4b, die der größeren Strömungsflut 11b zugeordnet ist, hin zur Abgasleitung 4a, die der kleineren Strömungsflut 11a zugeordnet ist. Im Bereich der Einmündung der Verbindungsleitung 19 in die Abgasleitung 4a kann ein Ejektor angeordnet sein, über den der Ab- gasfluss in die Abgasleitung 4a hinein unterstützt wird. Das unidirektionale Strömungsventil 20 ist als selbsttätig arbeitendes Ventil ausgebildet, welches keiner steuernden Einstellung bedarf. Es handelt sich bei dem St δmungsventil 20 beispielsweise um ein Rückschlagventil oder ein Flatterventil. Dieses Strömungsventil erlaubt einen Übertritt von Abgas aus der rechten Abgasleitung 4b in die linke Abgasleitung 4a für den Fall, dass durch Druckpulsationen erzeugte Druckspitzen in der Abgasleitung 4b den aktuellen Druck in der linken Abgasleitung 4a übersteigen. Hierdurch- wird das Druckniveau, welches in der linken Abgasleitung 4a herrscht, gesteigert. Da von der linken Abgasleitung 4a die Abgasrückführleitung 15 der Abgasrückführeinrichtung 14 abzweigt, wird der Betriebs- bereich, in welchem eine Abgasrückführung durchgeführt werden kann, verbreitert.The two exhaust gas lines 4a and 4b are connected upstream of the exhaust gas turbine 3 via a connecting line 19, in which a unidirectional flow valve 20 is arranged, which allows exhaust gas to pass in only one direction, namely from the exhaust gas line 4b, which is associated with the larger flow stream 11b , towards the exhaust pipe 4a, which is associated with the smaller flow flood 11a. An ejector can be arranged in the region of the junction of the connecting line 19 into the exhaust gas line 4a, via which the exhaust gas flow is supported into the exhaust gas line 4a. The The unidirectional flow valve 20 is designed as an automatically operating valve, which does not require any control setting. The flow control valve 20 is, for example, a check valve or a flutter valve. This flow valve allows exhaust gas to pass from the right exhaust line 4b into the left exhaust line 4a in the event that pressure peaks in the exhaust line 4b generated by pressure pulsations exceed the current pressure in the left exhaust line 4a. As a result, the pressure level prevailing in the left exhaust line 4a is increased. Since the exhaust gas recirculation line 15 of the exhaust gas recirculation device 14 branches off from the left exhaust gas line 4a, the operating range in which exhaust gas recirculation can be carried out is widened.
Gegebenenfalls kommt auch ein steuerbares bzw. einstellbares unidirektionales Strömungsventil 20 in Betracht, welches insbesondere in eine jeglichen Durchfluss sperrende Schließposition überführt werden kann.If appropriate, a controllable or adjustable unidirectional flow valve 20 can also be considered, which can in particular be transferred to a closing position blocking any flow.
Unmittelbar vor dem Eintritt der linken Abgasleitung 4a in die kleinere Strömungsflut 11a zweigt von der Abgasleitung eine Umgehungsleitung 21 ab, welche einen Bypass zur Abgasturbine 3 darstellt . Im Bereich der Abzweigung befindet sich ein einstellbares Ablassventil 22 in der Abgasleitung 4a, welches insbesondere bei höheren Motordrehzahlen in eine die Umgehungsleitung 21 öffnende Position geschaltet wird, so dass Abgas aus der Abgasleitung 4a unter Umgehung der Abgasturbine unmittelbar abgeleitet werden kann und unter dem entspannten Druck p abgeführt wird.Immediately before the left exhaust line 4a enters the smaller flow flood 11a, a bypass line 21 branches off from the exhaust line and represents a bypass to the exhaust gas turbine 3. In the region of the branch there is an adjustable drain valve 22 in the exhaust line 4a, which is switched into a position opening the bypass line 21, in particular at higher engine speeds, so that exhaust gas can be discharged from the exhaust line 4a bypassing the exhaust gas turbine and under the relaxed pressure p is dissipated.
In Fig. 2 ist eine modifizierte Ausführung dargestellt. Die Verbindungsleitung 19 zweigt stromab der Abgasturbine 3 von der rechten Abgasleitung 4b ab, die der größeren Strömungs- flut 11b der Turbine zugeordnet ist, und mündet unmittelbar in die Abgasrückführleitung 15 stromab des Rückführventiles 16. Das Rückführventil 16, welches in einem Leitungsabschnitt zwischen der Abgasrückführleitung 15 und der linken Abgasleitung 4a für die kleinere Strömungsflut 11a angeordnet ist, kann ebenfalls als unidirektionales Strömungsventil ausgebildet sein, beispielsweise als Rückschlagventil oder als Flatterventil, so dass über das Abgasrückführventil 16 Druckspitzen durchgelassen und in die Abgasrückführleitung 15 übertragen werden, welche in der linken Abgasleitung 4a anliegen und den aktuell herrschenden Druck in der Abgasrückführleitung 15 übersteigen. Über die Verbindungsleitung 19 werden zusätzliche Druckspitzen aus der rechten Abgasleitung 4b in die Abgasrückführleitung 15 übertragen, welche ebenfalls den in der Abgasrückführleitung 15 aktuell herrschenden Druck übersteigen.A modified embodiment is shown in FIG. The connecting line 19 branches off downstream of the exhaust gas turbine 3 from the right exhaust line 4b, which is assigned to the larger flow stream 11b of the turbine, and opens directly into the exhaust gas recirculation line 15 downstream of the recirculation valve 16. The recirculation valve 16, which is arranged in a line section between the exhaust gas recirculation line 15 and the left exhaust gas line 4a for the smaller flow flood 11a, can also be designed as a unidirectional flow valve, for example as a check valve or as a flap valve, so that pressure peaks are passed through the exhaust gas recirculation valve 16 and transmitted into the exhaust gas recirculation line 15, which are present in the left exhaust gas line 4a and exceed the currently prevailing pressure in the exhaust gas recirculation line 15. Via the connecting line 19, additional pressure peaks are transmitted from the right exhaust gas line 4b into the exhaust gas recirculation line 15, which likewise exceed the pressure currently prevailing in the exhaust gas recirculation line 15.
Die Druckregulierung in der linken Abgasleitung 4a kann über die Einstellung des Ablassventiles 22 und die Umgehungsleitung 21 erfolgen. Durch Öffnen des Ablassventiles 22 kann zumindest ein Teilstrom des Abgases in der linken Abgasleitung 4a unter Umgehung der Abgasturbine abgeleitet werden. Es kann aber auch zweckmäßig sein, das Rückführventil 16 aus der Abgasrückführeinrichtung 14 einstellbar auszuführen und in Abhängigkeit des aktuellen Zustandes der Brennkraftmaschine zu öffnen und zu schließen.The pressure regulation in the left exhaust gas line 4a can take place via the setting of the drain valve 22 and the bypass line 21. By opening the exhaust valve 22, at least a partial flow of the exhaust gas in the left exhaust pipe 4a can be discharged bypassing the exhaust gas turbine. However, it may also be expedient to make the recirculation valve 16 adjustable from the exhaust gas recirculation device 14 and to open and close it in dependence on the current state of the internal combustion engine.
In der Ausführung gemäß Fig. 3 ist die Verbindungsleitung 19 zwischen den beiden Abgasleitungen 4a und 4b angeordnet. Das unidirektionale Strömungsventil 20 erlaubt einen Durchfluss von Abgas von der rechten Abgasleitung 4b ausgehend hin zur linken Abgasleitung 4a. Die Regulierung des in den Ansaugtrakt 6 zu überführenden Abgasmassenstromes erfolgt mit Hilfe des einstellbaren Rückführventiles 16 in der Abgasrückführleitung 15. Die Abgasturbine 3 ist ebenfalls mit einer variablen Turbinengeometrie 13 ausgestattet, die jedoch im Unterschied zu den vorhergehenden Ausführungsbeispielen sich auf den Strδ- mungseintrittsquerschnitt von der größeren Strömungsflut 11b zum Turbinenrad 8 beschränkt, wohingegen im Strδmungsein- trittsquerschnitt der kleineren Strömungsflut 11a zum Turbinenrad 8 ein Gitter 23 mit einer Festgeometrie angeordnet ist. Die variable Turbinengeometrie 13 ist als Leitgitter mit verstellbaren, um . jeweils eine Drehachse verschwenkbaren Leitschaufeln ausgeführt. Diese Aufteilung der Strömungseintrittsquerschnitte mit variabler Turbinengeometrie einerseits und Festgeometrie andererseits ermöglicht eine Funktionsaufteilung, indem die größere Strömungsflut 11b mittels der Einstellung der variablen Turbinengeometrie 13 maßgeblich die Turbinendrehzahl beeinflusst, wohingegen die kleinere Strömungsflut 11a durch den Aufstau des Abgasgegendruckes für ein vergleichsweise hohes Druckniveau sorgt, das für die Abgas- rückführung genutzt werden kann. Über die Verbindungsleitungen 19 und das Strömungsventil 20 können zwischen den beiden Abgasleitungen 4a und 4b Druckspitzen übertragen werden. 3, the connecting line 19 is arranged between the two exhaust lines 4a and 4b. The unidirectional flow valve 20 allows a flow of exhaust gas from the right exhaust pipe 4b to the left exhaust pipe 4a. The exhaust gas mass flow to be transferred to the intake tract 6 is regulated with the aid of the adjustable recirculation valve 16 in the exhaust gas recirculation line 15. The exhaust gas turbine 3 is also equipped with a variable turbine geometry 13, which, however, in contrast to the previous exemplary embodiments, is limited to the flow inlet cross section from the larger flow stream 11b to the turbine wheel 8, whereas in the flow inlet cross section the smaller flow stream 11a to the turbine wheel 8 is a grid 23 is arranged with a fixed geometry. The variable turbine geometry 13 is designed as a guide grill with adjustable. each have an axis of rotation pivotable guide vanes. This division of the flow inlet cross sections with variable turbine geometry on the one hand and fixed geometry on the other hand enables a functional division in that the larger flow stream 11b significantly influences the turbine speed by means of the setting of the variable turbine geometry 13, whereas the smaller flow stream 11a ensures a comparatively high pressure level due to the build-up of the exhaust gas back pressure can be used for exhaust gas recirculation. Pressure peaks can be transmitted between the two exhaust lines 4a and 4b via the connecting lines 19 and the flow valve 20.

Claims

Patentansprüche claims
1. Brennkraftmaschine mit einem Abgasturbolader und einer Abgasrückführeinrichtung, wobei die Abgasturbine (3) zwei separate, dem Turbinenrad (8) vorgelagerte Strömungsfluten (11a, 11b) mit unterschiedlichem Querschnitt aufweist und jede Strömungsflut (11a, 11b) mit jeweils einer Abgasleitung (4a, 4b) zur Versorgung mit Abgas der Brennkraftmaschine (1) verbunden ist, und wobei eine Abgasrückführleitung (15) der Abgasrückführeinrichtung (14) die der kleineren Strömungsflut1. Internal combustion engine with an exhaust gas turbocharger and an exhaust gas recirculation device, the exhaust gas turbine (3) having two separate flow streams (11a, 11b) upstream of the turbine wheel (8) with different cross sections and each flow stream (11a, 11b) each with an exhaust gas line (4a, 4b) for supplying exhaust gas from the internal combustion engine (1), and an exhaust gas recirculation line (15) of the exhaust gas recirculation device (14) is connected to the smaller flow stream
(11a) zugeordnete Abgasleitung (4a) mit dem Ansaugtrakt (6) der Brennkraftmaschine (1) verbindet, d a d u r c h g e k e n n z e i c h n e t , dass die der größeren Strδmungsflut (11b) zugeordnete Abgasleitung (4b) über eine Verbindungsleitung (19) mit der Abgasrückführleitung (15) kommuniziert, wobei in der Verbindungsleitung (19) ein unidirektionales Strömungsventil (20) in der Weise angeordnet ist, dass der Durchfluss von der der größeren Strömungsflut (11b) zugeordneten Abgasleitung (4b) in Richtung Abgasrückführleitung (15) erfolgt.(11a) associated exhaust pipe (4a) connects to the intake tract (6) of the internal combustion engine (1), characterized in that the exhaust pipe (4b) assigned to the larger flow flood (11b) communicates with the exhaust gas recirculation line (15) via a connecting line (19), wherein a unidirectional flow valve (20) is arranged in the connecting line (19) in such a way that the flow from the exhaust line (4b) assigned to the larger flow stream (11b) takes place in the direction of the exhaust gas return line (15).
2. Brennkraftmaschine nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass das Strömungsventil (20) als selbsttätig arbeitendes Ventil ausgebildet ist.2. Internal combustion engine according to claim 1, so that the flow valve (20) is designed as an automatically operating valve.
3. Brennkraftmaschine nach Anspruch 2 , d a d u r c h .g e k e n n z e i c h n e t , dass das Strömungsventil (20) als Flatterventil ausgebildet ist. 3. Internal combustion engine according to claim 2, characterized . characterized in that the flow valve (20) is designed as a flutter valve.
4. Brennkraftmaschine nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , dass die Verbindungsleitung (19) die Abgasleitung (4b) für die größere Strömungsflut (11b) mit der Abgasleitung (4a) für die kleinere Strömungsflut (11a) verbindet.4. Internal combustion engine according to one of claims 1 to 3, so that the connecting line (19) connects the exhaust line (4b) for the larger flow stream (11b) with the exhaust line (4a) for the smaller flow flow (11a).
5. Brennkraftmaschine nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , dass die Verbindungsleitung (19) die Abgasleitung (4b) für die größere Strömungsflut (11b) mit der Abgasrückführleitung (15) verbindet.5. Internal combustion engine according to one of claims 1 to 3, so that the connecting line (19) connects the exhaust line (4b) for the larger flow stream (11b) to the exhaust gas recirculation line (15).
6. Brennkraftmaschine nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t , dass die Verbindungsleitung (19) stromab eines Rückführventils (16) in die Abgasrückführleitung (15) einmündet.6. Internal combustion engine according to claim 5, so that the connecting line (19) opens downstream of a recirculation valve (16) into the exhaust gas recirculation line (15).
7. Brennkraftmaschine nach Anspruch 5 oder 6, d a d u r c h g e k e n n z e i c h n e t , dass das Rückführventil (16) in der Abgasrückführleitung (15) als Flatterventil ausgeführt ist.7. Internal combustion engine according to claim 5 or 6, so that the return valve (16) in the exhaust gas recirculation line (15) is designed as a flap valve.
8. Brennkraftmaschine nach einem der Ansprüche 1 bis 7, d a d u r c h g e k e n n z e i c h n e t , dass in der der kleineren Strδmungsflut (11a) der Abgasturbine (3) zugeordneten Abgasleitung (4a) ein steuerbares Abblaseventil (22) angeordnet ist. 8. Internal combustion engine according to one of claims 1 to 7, so that a controllable blow-off valve (22) is arranged in the exhaust pipe (4a) associated with the smaller flow stream (11a) of the exhaust gas turbine (3).
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US8522547B2 (en) 2008-08-21 2013-09-03 Daimler Ag Exhaust gas turbocharger for an internal combustion engine of a motor vehicle
FR2945579A1 (en) * 2009-05-15 2010-11-19 Inst Francais Du Petrole Method for controlling exhaust gas recirculated at inlet of diesel type supercharged internal combustion engine, involves establishing controlled connection of exhaust gas circulation from exhaust gas outlet to another exhaust gas outlet
WO2014018207A1 (en) * 2012-07-25 2014-01-30 General Electric Company Systems and methods for routing exhaust
US9464582B2 (en) 2012-07-25 2016-10-11 General Electric Company Systems and methods for routing exhaust

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